HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 429

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

11.1
The H8S/2245 Group has a single-channel on-chip watchdog timer (WDT) for monitoring system
operation. The WDT outputs an overflow signal (WDTOVF) if a system crash prevents the CPU
from writing to the timer counter, allowing it to overflow. At the same time, the WDT can also
generate an internal reset signal for the H8S/2245 Group.
When this watchdog function is not needed, the WDT can be used as an interval timer. In interval
timer operation, an interval timer interrupt is generated each time the counter overflows.
11.1.1
WDT features are listed below.
Switchable between watchdog timer mode and interval timer mode
WDTOVF output when in watchdog timer mode
If the counter overflows, the WDT outputs WDTOVF. It is possible to select whether or not
the entire H8S/2245 Group is reset at the same time. This internal reset can be a power-on reset
or a manual reset.
Interrupt generation when in interval timer mode
If the counter overflows, the WDT generates an interval timer interrupt.
Choice of eight counter clock sources.
Overview
Features
Section 11 Watchdog Timer
Rev.3.00 Mar. 26, 2007 Page 387 of 772
Section 11 Watchdog Timer
REJ09B0355-0300